My three cents:
- Don't lower your standards in order to feel loved or appreciated: you will only find jerks who are using you that way.
- Before talking to HR, go online to your Intranet, and find the HR policies. It is very very likely that they are published online. Also try and see if there is an LGBTetc group. Google the name of your company and "Gay Pride", to see if they have a presence at pride. Even if they are only paying lip service to it, it is a good place to start.
- Once you have all that info, then contact HR if you have questions: they will be helpful and inclusive, and their job is to support to be yourself, so that you can be the most productive you can be. Welcome to the good side of capitalism!
(Also Google your clients and Pride: you maybe able to bring "diversity" opportunities to your company, as some firms nowadays will demand of their vendors/contractors that they have a diversity policy and are LGBTetc friendly, as much as in the past they may have started demanding that they have Health and Safety policies, or abide by SOx!